advice re colleague behaviour

a colleague has been generally disrespectful but has not done or said anything that I have felt unable to speak to him about.(eg coming in 1.5 hrs late after I'd contacted him and told him we were short staffed and please come in on time)

i have a radio at work (permission given in team meeting and formally agreed) as on night shift we have some periods of inactivity.There is also a team tv that others watch but I prefer radio.

i have often found the radio in a 'dead space' between a wall and the shared desk- suspected its been put there by colleague who shares the desk - today found radio in the gap and after retrieving it found out its not working-another colleague told me today that the person deliberately held the radio above the gap between the desk an wall and dropped it - spoke to my line manager who basically told me that as a Christian I should turn the other cheek and let it go

I bought the radio for the office but never reclaimed the money from work so effectively its my property- can i raise a grievance about this colleague's mishandling of my personal property?

i intend to speak to him in the morning but from past experience with him doubt i will get any explanation or offer to replace or apology if he says it was an 'accident'

i've never gone to a manager before speaking directly to the person- giving them a chance to resolve the issue with me directly-

i spoke to my line manager about it today because i was so unhappy and wont see my colleague until tomorrow-

line manager has previously told ( i put this me his way of dealing with inter-personal issues between staff is to listen to complaining colleague -in his words 'flap their gums' and tell them he will 'have a word' with person complained about, but really intends to do (and does) nothing- then the issue 'just goes away'-

i'm more of an assertive person and wont sit nursing an annoyance and complaining behind someone's back, i'd rather deal with it directly

i am most annoyed about this particular issue- i never put the radio on when on duty with this person- i never object when he puts the tv on- but feel that i may change my approach in future